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Left arrow key not collapsing expanded row in WinGrid

In the default KeyActionMappings, there's an entry for the Left keycode with:
ActionCode=CollapseRow, StateDisallowed=Cell, StateRequired=RowExpandable Or RowExpanded

It doesn't work for me - I can't get the Left key to collapse the row. I've tried clearing everything from KeyActionMappings except this line, and even replacing it with
ActionCode=CollapseRow, StateDisallowed=0, StateRequired=0

but nothing works. What am I doing wrong?